Mw. drs. J. Limpens : Prospects for Sphagnum bogs?

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4 Apr 2003 16:00
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr. F. Berendse (Nature Conservation and Plant Ecology)

 This thesis explores to what extent high N deposition affects bogs and impacts on restoration perspectives. Our results show that the negative effects of N deposition are numerous and are expressed in diverse ways. Fortunately, the impact of these effects largely depends on the amount of deposited N that Sphagnum incorporates in its tissue and on the resulting tissue N concentration. As such, the impact of a high N supply is not so much determined by the level of N deposition per se than by the balance between the negative effects of N on the one hand and the supply of potentially growth-limiting factors on the other hand. Thus, it seems possible to circumvent part of the negative N effects by optimising the overall growing conditions of Sphagnum. However, we must realise that the resilience of the bog ecosystem and the range of conditions under which Sphagnum bogs can survive decrease with N deposition, and thus are limited.
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